Two effective thermal conductivity models for porous media with hollow spherical agglomerates

被引：42
|
作者：
Yu, Fan [1 ]
Wei, Gaosheng [1 ]
Zhang, Xinxin [1 ]
Chen, Kui [1 ]
机构：
[1] Univ Sci & Technol Beijing, Dept Thermal Engn, Beijing 100083, Peoples R China
来源：
INTERNATIONAL JOURNAL OF THERMOPHYSICS | 2006年 / 27卷 / 01期
基金：
中国国家自然科学基金;
关键词：
calcium silicatem; insulation; thermal conductivity; xonotlite;
D O I：
10.1007/s10765-006-0032-7
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Based on the microstructure features of xonotlite-type micro-pore calcium silicate, two unit cell models, the point-contact hollow spherical model and the surface-contact hollow cubic model, are developed. As one of several excellent insulation materials, xonotlite is represented as porous media with hollow spherical agglomerates. By one-dimensional heat conduction analysis using theunit cell, the effective thermal conductivity of xonotlite is determined. The results show that both of the models are in agreement with experimental data. The algebraic expressions based on the unit cell models can be used to calculate the effective thermal conductivity of porous media that have similar structure features as xonotlite.
引用
收藏
页码：293 / 303
页数：11
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